Preparation and electrochemical properties of SrCe 0·4 Zr 0·4 Yb 0·2 O 2·9 electrolyte

Abstract

The perovskite Yb-doped strontium cerate-zirconate material, SrCe 0•4 Zr 0•4 Yb 0•2 O 2•9 , was prepared by solid-state reaction and the structure was characterized by X-ray diffraction. The calcination process of the powder was investigated by thermogravimetric/differential thermal analysis (TG-DTA). The high temperature conductivities were measured by d.c. four-probe technique in the temperature range from 500 to 950 • C in wet hydrogen and effect of temperature on conductivity was investigated. The conductivity increased with the elevation of temperature from 500 to 950 • C. The highest conductivity of 4•4 × 10 −2 S•cm −1 was observed for SrCe 0•4 Zr 0•4 Yb 0•2 O 2•9 at 950 • C. The current-voltage (I-V) and current-power (I-P) characteristics of the single cell (H 2 , Pt/SrCe 0•4 Zr 0•4 Yb 0•2 O 2•9 /Pt, O 2) at temperature range from 600 to 850 • C were tested. With the temperature increasing from 600 to 850 • C, the open circuit voltage (OCV) decreased from 1•164 to 1•073 V and the ionic transfer number decreased from 0•996 to 0•946. At 850 • C, the maximum power density of 25•2 mW•cm −2 was observed.

Growth of proton conducting strontium cerate composites

“…They applied the same perovskite as an electrolyte for hydrogen-oxygen cells and studied the I-V, and I-P characteristics in 600℃ to 850℃. The open circuit voltage diminished from 1.164 V to 1.073 V and the ionic transfer number from 0.996 up to 0.946 on increasing the temperature from 600℃ to 850℃ [27]. Researchers have adopted several techniques for SCP synthesis, out of which solid-state reaction was performed deeply due to its easiness in sample preparation, Figure 5.…”